Completes 1908 without Web Push. While the app is open, due reminders now actually surface; recurring reminders + snooze/done are manageable. - reminders store (singleton): polls /api/notes/reminders every 45s while the app is open; each due reminder fires ONCE as a toast (with an "Open" action) and, if the user opts in, a page-context OS Notification — no service worker, no PWA. Silently primes a stale backlog on first load; only announces recently-due ones. AppShell starts/stops it. - Editor reminder section: a Repeat picker (Does not repeat / Daily / Weekly / Monthly / Yearly) + Done (advances a recurring reminder / clears a one-off) + Snooze 1h/1d, shown when a reminder is set. - RemindersView rebuilt as a chronological list: per row a due time + recurrence badge + Done / 1h / 1d, click to open; plus an "Enable notifications" opt-in and a note that background alerts come with native. - Note type gains `recurrence`; notes store setRecurrence / completeReminder / snoozeReminder. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FRgehjoz7Yv8LkUfADxACm